Transcript for Florida Boat Accident: One Dead, Several Injured After Boat Capsizes

Now, to a deadly boat accident that happened just off the coast of florida. A woman is dead and several more were hurt after a boat capsized near pompano beach, florida. The group was back from a thanksgiving diving trip. And bazi kanani has the story. Reporter: Witnesses say the wave came out of nowhere. It was windy. There were waves rolling in. Reporter: The force, apparently so intense, water went over the 45-foot catamaran, tossing the 21 divers and 2 crew members onboard into the ocean. Chaos. People just in the water and stuff. It's like unbelievable. Reporter: And rolling the massive boat upside down. The wave caught it from behind and it flipped, as he was coming in the harbor. Reporter: Investigators say one woman was killed after she was trapped beneath the capsized boat. Other passengers, many with injuries, climbed out of the water and on to the overturned hull. We started to do a headcount on everybody. And they were missing one. Reporter: As beachgoers called 911, nearby boaters raced towards the accident, pulling people on to wave runners and into rescue boats. Captain bob casey was among the first to reach the scene. Your adrenaline kicks in. You want to get people onboard as quickly as possible. I came up to them and started pulling them out one at a time. Reporter: Late thursday, investigators questioned survivors. This morning, they say it does not appear the boat was over its capacity. But they are still trying to figure out how a single wave could have caused this massive glass-bottom boat to end up like this. The woman who was killed, 54-year-old nina poppelsdorf, was visiting from new mexico. All others are recovering at home this morning. And considering the force of that wave and the damage it did to the boat, it's surprising there weren't more serious injuries. Wow. All right. Thank you so much, bazi. Thank you, bazi.

This transcript has been automatically generated and may not be 100% accurate.

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